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How do you fix a situation where the paving in the garage is sagging because of the car?

I have the following problem: our paved garage has a basement, so there is a layer of bitumen under the pavers and thermal insulation underneath.

Now the paving has sagged so much due to the car that the bitumen pad underneath is in danger of cracking. We suspect that too soft a material was chosen for the insulation.

One option would be to tear everything down, update the insulation and make it more "stable" and/or remove the pavers and instead make a floor slab of one poured concrete with reinforcement. But that's very costly and expensive.

Is it possible to put some kind of reinforcement in the rubble under the paving stones? For example, something similar to grass mesh. Then the weight of the car would be distributed a little better, wouldn't it? Then the whole substructure could also remain intact, and most importantly, I could do everything myself. I realize, of course, that this is not really a "standard solution." I just want it to last a long time. Where is the danger in such a design? Will such rebar eventually push through a layer of bitumen?

• garage